Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net loss available for common shareholders - basic and diluted	$ (3,556)	$ (3,962)
Denominator:
Weighted-average shares outstanding - basic and diluted	47,566	44,963
Net loss per share - basic and diluted	$ (0.07)	$ (0.09)